Why can i only 'read' from some portable hard drives

I'm having trouble with some portable hard drives. I can only read them and not copy to. Why is this, and can i change this?

Keller is right - you probably have an NTFS drive - if it is yours, and you don't need to share it with folks with Windows machines, reformat it for HFS+. If you need to share it, and don't have files larger than 2gb, format it for FAT32. If you need to share it and need to move large files (larger than 2gb) then you'll have to figure something out with NTFS 3G or some other fix.

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http://docs.info.apple.com/article.html?artnum=301580
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http://fuzzy.wordpress.com/2006/12/10/ioerror-36/
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Why can i only 'read' from some portable hard drives

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